Please help! This 2003 dodge carvan sport 3.3

Asked by Apr 26, 2017 at 11:14 AM about the 2003 Dodge Caravan Sport

Question type: Maintenance & Repair

This thing has send me though hell and
back!

It keeps blowing the map Sensor 3x
replaced
I was told by Hendrick auto shop is was the
engine computer. I had it sent off for repair
come to find out NOTHING was wrong with
it.

I am at a loss here I a a single mom with 3
kids I need this darn thing running!

1 Answer

116,705

The Manifold Absolute Pressure (MAP) sensor is used by the Powertrain Control Module (PCM) for engine load input. The PCM uses this input, as well as others, to calculate the correct amount of fuel to inject into the cylinders. The MAP sensor measures the absolute pressure inside the intake manifold of the engine. At sea level, atmospheric pressure is about 14.7 psi (pounds per square inch). When the engine is off, the absolute pressure inside the intake equals atmospheric pressure, so the MAP will indicate about 14.7 psi. At a perfect vacuum, the MAP sensor will read 0 psi. When the engine is running, the downward motion of the pistons create a vacuum inside the intake manifold (For the purposes of engine control, when a technician says vacuum, what they are really saying is pressure that is less than atmospheric pressure). With a running engine, intake manifold vacuum usually runs around 18 - 20 “Hg (inches of mercury). At 20 “Hg, the MAP sensor will indicate about 5 psi. This is because the MAP sensor measures “absolute” pressure, based on a perfect vacuum, rather than atmospheric pressure. Make sure your shop replaces all the vacuum hoses on the car...

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